CVE-2025-39868

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

erofs: fix runtime warning on truncate_folio_batch_exceptionals()

Commit 0e2f80afcfa6("fs/dax: ensure all pages are idle prior to

filesystem unmount") introduced the WARN_ON_ONCE to capture whether

the filesystem has removed all DAX entries or not and applied the

fix to xfs and ext4.

Apply the missed fix on erofs to fix the runtime warning:

[ 5.266254] ------------[ cut here ]------------

[ 5.266274] WARNING: CPU: 6 PID: 3109 at mm/truncate.c:89 truncate_folio_batch_exceptionals+0xff/0x260

[ 5.266294] Modules linked in:

[ 5.266999] CPU: 6 UID: 0 PID: 3109 Comm: umount Tainted: G S 6.16.0+ #6 PREEMPT(voluntary)

[ 5.267012] Tainted: [S]=CPU_OUT_OF_SPEC

[ 5.267017] Hardware name: Dell Inc. OptiPlex 5000/05WXFV, BIOS 1.5.1 08/24/2022

[ 5.267024] RIP: 0010:truncate_folio_batch_exceptionals+0xff/0x260

[ 5.267076] Code: 00 00 41 39 df 7f 11 eb 78 83 c3 01 49 83 c4 08 41 39 df 74 6c 48 63 f3 48 83

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References